Lu Jiu

Biodata

Background

Lu Jiu served as Si Jinyan's personal doctor before Chi Li entered the Marshal's household. He initially opposed moving Chi Li into the residence, recommending that Si Jinyan instead return to the institute whenever his susceptible period approached. Si Jinyan rejected the proposal. 2

He has spent years researching ancient records concerning merfolk biology and the missing Merfolk Core scale near Si Jinyan's heart. His findings establish that the Core scale protects a merfolk's heart and is associated with extraordinary restorative and defensive properties. 13

After Chi Li's arrival, Lu Jiu monitors the unprecedented effects of their compatibility: Si Jinyan's condition stabilizes markedly, but the Marshal develops an escalating physical dependence on Chi Li. 25 50

Lu Jiu first met Si Jinyan when Si Jinyan was approximately fifteen years old and already confined to the institute's experiments. He remembers him as withdrawn, physically limited by his merfolk traits, and so accustomed to experimentation that he accepted it with alarming numbness. 79

Chi Li's recovered memories later clarify the mystery of Si Jinyan's missing Core scale: as a child, Si Jinyan removed the scale near his own heart and implanted it in Chi Li, binding their lives together. The scale eventually regrows around Si Jinyan's heart, curing the instability caused by its absence. 74 136

Following the fall of the Imperial experimental network, Lu Jiu takes control of an island base with suitable resources for medical and pharmaceutical work. He intends to establish a pharmaceutical company there, supported by Si Jinyan's investment. 131

Appearance

Lu Jiu appears to be in his twenties and has the approachable bearing of a recent college graduate, though his demeanor changes sharply when examining patients or confronting medical danger. 13

• Wears glasses. 13
• Usually smiles warmly, but scrutinizes others with a sharp gaze. 13
• Has a low, mellow voice. 20

Personality

Lu Jiu is observant, direct, and professionally uncompromising. He openly scolds Si Jinyan for endangering himself, refuses to minimize the risks of the Marshal's merfolk condition, and repeatedly warns him that Chi Li could become a fatal vulnerability. 13 25

Though unable to force Si Jinyan into treatment, he is among the few people willing to intervene when the Marshal loses control. His concern extends to Chi Li, whose injuries and exposure to Si Jinyan's unstable pheromones he treats as urgent medical dangers. 18 22

Outside medicine, Lu Jiu is teasing and persistent, particularly toward Qiu Rui. He uses flowers and playful remarks to provoke reactions, then privately studies Qiu Rui's habits with clinical precision. 25

Lu Jiu can be clinically pragmatic to an unsettling extent. When Si Jinyan's substitute suppressant declines sharply, he considers whether Chi Li can be used as a stabilizing treatment despite the sacrifices this may require of him. 53

However, his pragmatism is tempered by genuine protectiveness. He establishes safeguards before allowing Chi Li near an out-of-control Si Jinyan, keeps the proposed procedure involving their developing child strictly confidential, and refuses to immediately activate Si Jinyan's self-authorized destruction protocol during the institute crisis. 81 83 90

Abilities & Skills

Medical Expertise

Lu Jiu is a leading physician with specialized knowledge of pheromone disorders, secondary-gender physiology, and merfolk biology.

• Diagnosed the connection between Si Jinyan's Pheromone Deficiency Syndrome and the destabilization of his merfolk blood. 13
• Recognized the silver-black scales growing over Si Jinyan's healed bullet wound and administered treatment to conceal them. 13
• Identified the absence of Si Jinyan's protective Merfolk Core scale through years of research and clinical observation. 13
• Detected foreign sex-targeted genes in Si Jinyan's body, revealing that he had permanently marked Chi Li. 25
• Confirmed that Si Jinyan's permanent mark on Chi Li was fading and ruled out ordinary gland defects as an explanation. 26
• Explained that an Enigma can theoretically mark an alpha, but such marking would likely require prolonged exposure and cause pain and psychological resistance. 27
• Identified medical indicators that Chi Li had formed a biological bond with Si Jinyan and later determined that the developing child was an egg-shaped merfolk offspring rather than an ordinary fetus. 59 62
• Detected the scales beginning to appear on Chi Li's body and connected them to the changes caused by the developing egg. 69
• Determined that the developing entity had reached maturity and assessed that removal might be less dangerous to its survival than at an earlier stage. 83 85
• Planned and performed the confidential procedure intended to protect Chi Li and the developing child, limiting knowledge of it to himself and a trusted assistant. 89 90
• Monitors Eggy's health and growth after his birth, despite the lack of reliable medical information on merfolk eggs and hatchlings. 95 133
• Theorized that Si Jinyan's long-term loss-of-control disorder was linked both to the missing Core scale and to the Empire's prolonged experimentation on his body. 134

Pheromone Research

Lu Jiu studies methods of stabilizing Si Jinyan's volatile pheromones.

• Initially supported the use of compatible omegas to regulate Si Jinyan's susceptible periods. 2 13
• Determined that Chi Li's presence greatly improved Si Jinyan's condition while also creating dangerous dependency. 25
• Helped develop a substitute inhibitor that can temporarily stabilize Si Jinyan, though it cannot replace Chi Li's unique effect. 50
• Warned that extended contact between Si Jinyan and Chi Li may trap them in a worsening cycle of stabilization and instability. 50
• Tested extracted pheromones from Chi Li in Si Jinyan's containment chamber before permitting direct contact, confirming that Chi Li's scent could briefly calm Si Jinyan even in a feral state. 81
• Analyzed the fusion of Chi Li's pheromones with samples taken from Si Jinyan during periods of instability. 86
• Uses Si Jinyan's pheromones to support Eggy's incubation conditions and recognizes that Chi Li's pheromones may also benefit the hatchling. 95

Crisis Intervention

Lu Jiu acts as a medical safeguard when Si Jinyan's self-control deteriorates.

• Pulled Si Jinyan back from the brink of attacking Yao Di by calling his name and physically intervening. 18
• Warned Si Jinyan not to engage intimately with the injured Chi Li while his pheromones and merfolk traits were dangerously unstable. 22
• Monitored Si Jinyan through Qiu Rui when the Marshal refused direct examinations or stopped reporting his condition. 24
• Supervised Si Jinyan's voluntary confinement in a specially designed glass chamber when his vulnerable pheromones reached critical levels. 80 81
• Equipped Chi Li with an emergency bracelet, sedation support, and an extraction plan before allowing him to enter Si Jinyan's containment chamber. 81
• Coordinated the institute's response after Si Jinyan escaped his restraints, delaying the destruction protocol while preparing it as a last resort under Si Jinyan's own prior instructions. 83
• Intervened when Si Jinyan became violent toward Bai Qi after Chi Li's memory recovery, helping restrain the Marshal before the confrontation escalated further. 78

Relationships

• Si Jinyan — Personal doctor and long-standing confidant; Lu Jiu treats his pheromone disorder and merfolk instability, while repeatedly challenging his reckless and possessive decisions. He has known Si Jinyan since the latter's adolescence at the institute and remains one of the few people trusted to manage his containment and treatment. 2 13 18 25 79 80
• Chi Li — Patient and the source of Si Jinyan's unusual stabilization; Lu Jiu examines Chi Li's sensitivity periods, injuries, marks, and abnormal physiology. He later manages Chi Li's merfolk-related transformations, pregnancy, and Eggy's early medical care. 15 22 26 27 62 69 90 95
• Qiu Rui — Frequent contact and apparent romantic interest; Lu Jiu brings him pink roses, teases him, and carefully observes his embarrassed reactions. He later invites Qiu Rui to the island, though Qiu Rui initially refuses to attend. 24 25 131
• Eggy / Si Chi — Lu Jiu helps monitor Eggy's incubation and hatching, documents his extraordinary growth, and becomes attached enough to regard him almost as a godson. 95 113 133
• Geng Ji — Shares concern over Si Jinyan's deterioration and the danger of keeping Chi Li nearby. 50
• Yao Di — Opposes the Emperor's proposal to forcibly extract and preserve Chi Li's pheromones, though he is unable to openly defy him. 17
• Bai Qi — Assists in preventing Si Jinyan from attacking Bai Qi after the latter's involvement in Chi Li's recovered memories provokes the Marshal's rage. 78

Trivia

• Lu Jiu calculated that Qiu Rui took 0.09 seconds longer than usual to throw away a bouquet of pink roses. 25
• Despite being an alpha, Si Jinyan's pheromone pressure can immobilize Lu Jiu due to the Marshal's nature as an Enigma. 18
• Although he initially approaches Eggy as an unprecedented research subject, Lu Jiu becomes protective enough to worry over Eggy's care whenever Si Jinyan and Chi Li leave the base. 113